API or also known as Application program interface, is a set of routines and protocols as well as tools that allow for the building of software applications. The API specifies how software components should interact with each other. API’s are often used when programming graphical user interface components among other things.

so what is API V2? API V2 allows you to send a token id to perform operations on the user, which the token id refers.

V2 includes:

V2 brings new possibilities to interactions involved with software and users.  The GET, PUT, and DELETE requests allow for easier manipulation and alteration, ultimately saving time and frustration.